Hi All,
Salesforce.com is really a worth CRM Product.
It is based on Cloud computing.
There is no need of software and hardware to be installed. Just a browser is enough.
Log in with your username and password.
Everything is done effectively in cloud. From anywhere you can log in and work with it.

In SFDC there is no need to write complex SQL queries. Database is maintained by SFDC itself. Which is an added advantage for us.